Lead Backend Engineer - Open Banking & Connectivity

Mastercard Inc.; Cisie; On-site; PLN 180,000 - 240,000; Full time

Job summary

Mastercard Inc. in Poland is seeking a Lead Software Engineer for connectivity to build and operate scalable API connections to financial institutions across Europe.

You will own end-to-end delivery of secure, reliable connectivity services, solving complex problems, driving technical decisions and delivering high-quality systems from design through production. You will partner with Product and business stakeholders to deliver new capabilities, improve platform reliability, and scale

Qualifications

• 8–10 years of professional software engineering experience.
• Strong hands-on experience building cloud-based, highly available systems.
• Deep expertise in backend engineering (API design, reliability, production support).
• Proven ability to solve complex technical problems and influence design decisions.
• Experience delivering and operating end-to-end systems in production environments.
• Strong collaboration skills with Product and business stakeholders.
• Familiarity with banking/payments/open banking (PSD2) environments.
• Strong communication and problem-solving skills.

Responsibilities

• Own end-to-end delivery of engineering solutions—from design through development, deployment, and production support
• Solve complex technical problems and drive system design decisions
• Design, build, and operate scalable APIs and backend services
• Review code and uphold high standards of quality, performance, and maintainability
• Apply best practices across SDLC, testing, security, and observability
• Collaborate with Product, Architecture, Security, and SRE teams
• Implement robust testing strategies (unit, integration, end-to-end)
• Drive automation and improvements in developer productivity and operational efficiency
• Mentor engineers and support them in solving technical challenges and growing their skills

Skills

8–10 years experience

Cloud-based systems

Backend engineering

Product collaboration

PSD2/open banking familiarity

Tools

Azure

AWS

PostgreSQL

Java/Spring Boot

AI-assisted tools

Job description

Mastercard Inc. in Poland is seeking a Lead Software Engineer for connectivity to build and operate scalable API connections to financial institutions across Europe.

You will own end-to-end delivery of secure, reliable connectivity services, solving complex problems, driving technical decisions and delivering high-quality systems from design through production. You will partner with Product and business stakeholders to deliver new capabilities, improve platform reliability, and scale